JPH08136967A - Shutter controller for camera - Google Patents

Abstract

PURPOSE: To output a correct shutter time by adjusting the control of a shutter opening time to be a required state even when the accuracy of a shutter is somewhat low. CONSTITUTION: This controller is provided with an MCU 1 for controlling a camera, a shutter device 3 (first curtain 4 and second curtain 5) and the driving means 6 and 7 thereof. Further, it is provided with an arithmetic means 8 deciding the shutter time, a correction means correcting the shutter time and a memory means 2 for storing a correction value in order to execute the correcting action. The shutter curtains are controlled according to an adjustment value obtained from the memory means 2 and the shutter time obtained by the arithmetic means. The MCU 1 is provided with a means continuously controlling the control time of the shutter opening time obtained by adding the adjustment value of the high-speed shutter time until it becomes the minus value from the plus value. Then, when the shutter is controlled at the high-speed time, the control time obtained by adding the adjustment value is continuously controlled until it becomes the minus value from the plus value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter control device which is operated and controlled in a camera by using a microcomputer (hereinafter referred to as MCU) as a control device.

[0002]

2. Description of the Related Art Conventionally, as a shutter control device for a camera of this type, one having the following structure is known.
That is, as a shutter device used in a camera, conventionally, there are various structures, and for example, a vertically running type focal plane shutter is known.
Such a shutter device is provided with a front curtain which is a first curtain which starts to operate first and a rear curtain which is a second curtain which operates next.

In controlling the shutter in such a shutter device, the opening amount generated between both curtains and the opening time thereof are appropriately set by causing the front curtain to travel and then delaying a predetermined time to travel the rear curtain. By doing so, the opening time of the shutter, that is, the so-called shutter speed is determined.

By the way, in such a shutter device, the shutter adjustment is performed by moving the rear curtain with a predetermined shutter time after the front curtain travels with the front curtain as a reference, at which time the actual shutter curtain is opened. It was done by measuring the time.

That is, the adjustment of such a shutter is
Depending on the actual shutter operation condition, how much the trailing curtain travel start time deviates from the leading curtain is stored as an adjustment value in the storage means, and the adjustment value is added to the predetermined shutter time. The shutter has been corrected by the method, and as a result, an accurate shutter time can be obtained.

[0006]

However, according to the method of controlling the shutter in the conventional apparatus as described above, the following problems have occurred when a shutter with low accuracy is used. That is, if the rear curtain travels later than the front curtain even if the rear curtain travels at the same time as the front curtain, the shutter curtain does not open at the actually required shutter time at high speed seconds, or Without opening the shutter curtain,
The problem of being treated as a defective product, such as the inability to expose the film, is unavoidable.

The present invention has been made in view of the above circumstances, and when the shutter is at a high speed, the shutter opening time control time considering the adjustment value is continuously changed from a plus value to a minus value. It is an object of the present invention to obtain a shutter control device for a camera that uses a controllable program means and can output a shutter time that is as accurate as possible by adjustment, even if the shutter is somewhat inaccurate.

[0008]

In order to meet such a demand, a shutter control device for a camera according to the present invention includes a control device for controlling the camera, a shutter device for exposing a film, and this shutter device. A shutter driving means for driving the shutter, a computing means for determining the shutter time, a correcting means for correcting the shutter time, and a correction value for storing the correction value for the correction by the correcting means. And a means for continuously controlling the opening time control time of the shutter device from a plus value to a minus value in the shutter device in consideration of the time adjustment value at the shutter high speed time.

Further, in the shutter control device for a camera according to the present invention, the control outputs of the first and second curtains of the shutter device are respectively controlled as shutter driving means for driving the shutter device for exposing the film. Configured to be connected to the timer output of the device, and to the control device,
A means for continuously controlling the opening time of the shutter device from a plus value to a minus value in the shutter device in consideration of the time adjustment value at the high shutter speed time is provided.

[0010]

According to the present invention, even if the shutter adjustment value at high speeds adjusted by the shutter adjusting means becomes a positive value to a negative value, it is written and stored in the storage means, and the adjustment value and the calculation by this are stored. By combining the shutter time input from the means, it is possible to continuously adjust the shutter speed at high speed from a plus value to a minus value, so that the opening time of the shutter device can be accurately controlled and accurate shutter control can be performed. it can. And according to the present invention,
Up to now, even a camera that has a poor shutter speed setting outside the adjustment range can be adjusted as a good product.

[0011]

FIG. 1 is a block diagram showing an embodiment of a shutter control device for a camera according to the present invention. In the drawing, reference numeral 1 is a control device for controlling various operations of the camera, and MCU, and 2 is an adjustment device. It is a memory means as a storage means for writing and storing a value. A shutter device 3 controls the exposure of the film, and the shutter device 3 includes a front curtain 4 and a rear curtain 5. Reference numerals 6 and 7 are front curtain driving means and rear curtain driving means for driving the front curtain 4 and the rear curtain 5.

Then, the MCU 1 synthesizes the shutter time obtained from the apex calculation means shown by 8 in the drawing with the adjustment value obtained from the memory means 2 to drive the front curtain drive means 6 and the rear curtain drive means. The means 7 is controlled to determine the opening time of the shutter.

Here, the apex operation means 8 is adapted to output to the MCU 1 the shutter time which is set by calculation or manual setting for determining the shutter time from the photometric value obtained by the photometric means (not shown). Further, the MCU 1 is provided with a correction means for correcting the shutter time, and a correction value for performing the correction by the correction means is stored in the memory means 2.

According to the present invention, in such a structure, when the front curtain 4 and the rear curtain 5 of the shutter device 3 are driven and controlled, control is performed by the adjustment value acquired from the memory means 2 and the shutter time obtained by the apex operation means 8. I am trying to do it. Further, when the shutter device 3 is controlled at high speed, the MCU 1 is provided with shutter adjusting means capable of continuously controlling the control time in consideration of the above-mentioned adjustment value from plus to minus, With such a shutter adjustment means, shutter adjustment,
The control is performed according to the accuracy of the shutter control device,
The shutter can be controlled in a required state.

The operation of the camera other than the above is well known in the prior art, and the operation of the shutter control device according to the present invention will be limited to the operation.

FIGS. 2 and 3 are timing charts of a portion for performing shutter control in one embodiment of the device of the present invention.

That is, FIG. 2A shows the shutter device 3.
Is a control waveform when accurate shutter control is possible without correction of the shutter curtain (first curtain 4, second curtain 5).
The opening of the shutter is normally performed by the control signal. Further, (b) of the same figure shows a case where there is a delay until the rear curtain 5 actually starts moving even if the rear curtain 5 is driven by the rear curtain control signal. In order to correct this delay, (c) of the figure is used. ), The shutter control time in a normal state is obtained by driving the rear curtain control signal earlier by the time from the start of traveling of the rear curtain 5 by the rear curtain control signal to the actual rear curtain traveling. be able to.

Further, FIG. 3A shows a control waveform when the traveling of the front curtain is delayed with respect to the front curtain control signal contrary to the above. In such a case, contrary to the above-described FIG. 2C, as shown in FIG. 3B, the trailing-curtain control signal is set so that the traveling delay time of the leading curtain 4 is longer than the actual shutter time. Adjustment is performed by delaying the start of the traveling of the rear curtain 5 by the amount added, so that the shutter control time in a normal state can be obtained.

Further, FIG. 3C shows a waveform when the traveling of the rear curtain 5 is delayed by a time longer than twice the control shutter time. In such a case, the conventional shutter device 3
In the above adjusting method, the normal shutter time is output by adjusting the drive time of the rear curtain 5 with respect to the front curtain 4, so that the rear curtain 5 is driven faster than the front curtain 4. If it does, the adjustment will be improper.
However, according to the present invention, it is possible to continuously control the opening time of the shutter device 3 from plus to minus. Therefore, as shown in (d) of FIG. By outputting earlier than the front curtain control signal, the shutter control time in the normal state can be obtained.

FIG. 4 is a flow chart of an embodiment of the apparatus of the present invention in which the MCU 1 controls the shutter. This will be briefly described. When the shutter control is started, the shutter time is read from the apex calculation means 8 in step # 100. In addition, step # 1
In 01, the shutter correction value stored in the memory means 2 is read.

Then, in step # 102, the shutter time for actual shutter control is calculated based on the values read in steps # 100 and # 101.

In step # 103, step # 102
The sign of the shutter time output in step 1 is determined. If it is determined to be negative by the determination of the sign in step # 103, the process proceeds to step # 104, the shutter time is set in the timer, and then the running of the rear curtain 5 is started in step # 105.

On the other hand, if the result of the determination in step # 103 is positive, the process proceeds to step # 106, the shutter time is set in the timer, and then step # 10.
At 7, the front curtain 4 starts running.

Next, in step # 108, the shutter time set in steps # 104 and 106 is waited until the time is reached, and in step # 109, the front curtain 4 and the rear curtain for moving the shutter curtain which has not traveled. A signal for driving both 5 is output.

When the shutter time is judged to be "0" as a result of the judgment in step # 103, the front curtain 4 and the rear curtain 5 are driven at the same time.
At 110, the front curtain 4 and the rear curtain 5 start running at the same time.

5 to 7 are views showing how the shutter device 3 is driven. In each drawing, (a) shows the shutter curtain portion, and (b) shows the driving means. Here, FIG. 5 shows a state before the start of the shutter curtain traveling, in which the front curtain 4 and the rear curtain 5 are locked by the front curtain control means 6 and the rear curtain control means 7. Further, FIG. 6 shows a state in which the front curtain 4 is disengaged by the front curtain control means 6, the front curtain 4 travels, and the shutter is opened. Further, FIG. 7 shows a state in which the rear curtain 5 is released by the rear curtain control means 7, the rear curtain 5 runs, and the shutter is closed. It should be noted that such curtain movement of the shutter is well known, and a detailed description thereof will be omitted.

If the hardware of the MCU 1 has a margin and the output of the timer can be directly connected to the front curtain control means 6 and the rear curtain control means 7, each timer can be set including the adjustment value. It is possible to control the shutter opening time in consideration of the time adjustment value at the high speed time continuously from the plus value to the minus value.

In other words, in the shutter control device for a camera according to the present invention, the control time of the opening time in the shutter device 3 in which the time adjustment value at the shutter high speed time is added to the MCU 1 for controlling the camera is from plus to minus. The shutter adjusting means is provided for continuously controlling the value up to. Here, as the shutter driving means for driving the shutter device 3, the first curtain (first curtain 4) of the shutter device 3 is used.
And the control output of the second curtain (rear curtain 5) are connected to the timer output of the MCU 1, respectively.

Further, in the shutter control device according to the present invention having the above-mentioned structure, since the adjustment of the shutter at high speed can be continuously adjusted from plus to minus,
Even with a camera whose shutter precision has not been improved by the adjustment method used up to now, the adjustment can be performed, and it is not necessary to treat it as a defective product.

Further, according to the device of the present invention, since the adjustment at high speed can be freely performed, even a camera using the shutter device 3 which has only the ability of the shutter time of 1/2000, for example, can be adjusted depending on the adjustment. The camera can provide a shutter time of 1/4000, and as a result, the cost of the camera can be reduced.

The present invention is not limited to the structure of the above-described embodiment, but the shape, structure, etc. of each part of the shutter control device can be appropriately modified and changed, and various modified examples are possible.
For example, in the above-described embodiment, as the shutter device 3,
Although the vertically-running type shutter as shown in FIGS. 5 to 7 has been illustrated, it goes without saying that the shutter is not limited to this.

[0032]

As described above, according to the shutter control device for a camera of the present invention, the means for continuously adjusting the shutter speed at high speed from positive to negative is provided. Even if the camera does not have a high shutter accuracy, the adjustment can be performed, and the excellent effect of not having to handle the camera as a defective product can be obtained.

Further, according to the present invention, since adjustment at high speed can be freely performed, even a camera using a shutter having only a shutter time of 1/2000 can be adjusted to 1/4000 depending on the adjustment. It is possible to provide a camera that can provide the shutter time of, and as a result, it is possible to reduce the cost of the camera.

[Brief description of drawings]

FIG. 1 is a block diagram of a schematic configuration showing an embodiment of a shutter control device for a camera according to the present invention.

FIG. 2 is a timing chart of operation of the shutter control device for a camera according to the present invention under each condition of the shutter (a),
It is a timing chart shown in (b) and (c).

FIG. 3 is a timing chart showing operation timings of a shutter under conditions different from those of FIG. 2 in (a), (b), (c) and (d).

FIG. 4 is a flowchart showing shutter control according to the present invention.

FIG. 5A is a state diagram showing a state before the shutter curtain is started to be photographed, and FIG. 5B is a state diagram of the shutter curtain driving means.

FIG. 6A is a state diagram showing a state in which the front curtain of the shutter is traveling and exposing the film, and FIG. 6B is a state diagram of the shutter curtain driving means.

FIG. 7A is a state diagram in which the rear curtain of the shutter has traveled and exposure of the film has been completed, and FIG. 7B is a state diagram of the shutter curtain drive means.

[Explanation of symbols]

1 ... MCU (microcomputer; control device), 2 ...
Memory means (storage means), 3 ... Shutter device, 4 ... Front curtain, 5 ... Rear curtain, 6 ... Front curtain driving means, 7 ... Rear curtain driving means,
8 ... Apex calculation means.

Claims (2)

[Claims] 1. A control device for controlling a camera, a shutter device for exposing a film, a shutter drive means for driving the shutter device, a calculation means for determining a shutter time, and a shutter time. And a storage unit for storing a correction value for performing the correction by the correction unit, wherein the control device considers the time adjustment value at the shutter high speed second time. A shutter control device for a camera, comprising means for continuously controlling the opening time of the shutter device from a plus value to a minus value. 2. A control device for controlling a camera, a shutter device for exposing a film, a calculation means for determining a shutter time, a correction means for correcting the shutter time, and a correction means for correcting the shutter time. A storage unit for storing a correction value for performing correction, and a shutter drive unit in which the control outputs of the first curtain and the second curtain of the shutter device are connected to the timer output of the control device, respectively. The control device further comprises means for continuously controlling a control time of the opening time in the shutter device in consideration of a time adjustment value at a shutter high speed time from a plus value to a minus value. Shutter control device for camera.